Conservative:
(Adjective) holding to traditional attitudes and values and cautious about change or innovation, typically in relation to politics or religion.
(Noun) a person who is averse to change and holds to traditional values and attitudes, typically in relation to politics.
Progressive:
(Adjective) (of a group, person, or idea) favoring or implementing social reform or new, liberal ideas.
(Noun)a person advocating or implementing social reform or new, liberal ideas.
The democrats were the conservative party until into the 1900s.